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PU CMa bright outburst! Dear Colleagues, As reported by Rod Stubbings in [vsnet-outburst 5213], the short-period (candidaite) SU UMa-type dwarf nova PU CMa is undergoing a bright outburst. The present outburst may be a superoutburst! YYYYMMDD(UT) mag observer 20030108.492 <149 (Rod Stubbings) 20030109.491 <148 (Rod Stubbings) 20030110.501 <148 (Rod Stubbings) 20030111.505 <144 (Rod Stubbings) 20030111.667 <138 (Hiroshi Itoh) 20030112.499 <140 (Rod Stubbings) 20030112.765 <152 (Andrew Pearce) 20030115.488 <135 (Rod Stubbings) 20030118.506 <129 (Rod Stubbings) 20030119.481 <135 (Rod Stubbings) 20030120.587 <150 (Andrew Pearce) 20030122.494 <150 (Rod Stubbings) 20030123.481 151 (Rod Stubbings) 20030125.483 <148 (Rod Stubbings) 20030126.560 <138 (Andrew Pearce) 20030127.524 <150 (Rod Stubbings) 20030128.473 <148 (Rod Stubbings) 20030131.464 <148 (Rod Stubbings) 20030208.458 <144 (Rod Stubbings) 20030210.485 <140 (Rod Stubbings) 20030211.517 <140 (Rod Stubbings) 20030213.489 112 (Rod Stubbings) [From Kato et al., MNRAS in press (astro-ph/0210674)] === Up to now, three three long outbursts (likely superoutbursts) [JD 2451677 (2000 May), 2452056 (2001 June), 2452418 (2002 May)] were detected. Although definitive classification requires further time-resolved photometry, we propose that PU CMa to be an excellent candidate for an SU UMa-type dwarf nova. This indication is also strengthened by the recently reported orbital period of 0.05669(4) d (Thorstenesen and Fenton 2002). This period is one of the shortest periods among the known SU UMa-type dwarf novae (Thorstensen et al. 2002). Most of the systems with similar orbital periods show significant deviations (either related to WZ Sge-type dwarf novae or ER UMa-type dwarf novae) from normal SU UMa-type dwarf novae. PU CMa, with its outburst properties strongly resembling a normal SU UMa-type dwarf nova may be the first object filling the gap between the extreme WZ Sge-type and ER UMa-type systems. === Urgent time-series photometric observations are undoubtedly most needed! The Kyoto team (obervser Ishioka-san) magaged to take time-series observation last night, which will be soon analyzed. Please turn your telescope to this unusual and bright (11th mag) dwarf nova in outburst! Regards, Taichi Kato VSNET Collaboration team
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